Alternator Signal Circuit Troubleshooting
- Start the engine, and let it idle.
- Monitor the ALTERNATOR in the DATA LIST with the HDS.
- Check if the indicated percentage varies when the headlight switch is turned on.
Does the percentage vary?
YES -The alternator signal circuit is OK.
NO -Go to next step.
- Turn the headlight switch OFF and the ignition switch to LOCK (0).
- Jump the SCS line with the HDS.
- Disconnect the alternator 4P connector.
- Disconnect PCM connector C (49P).
- Check for continuity between PCM connector terminal C44 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short in the wire between the PCM (C44) and the alternator.
NO -Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).